Matching lite ammunition with lite draw bands is relatively easy and cheap enough for practicing. Heavier bands and Heavy ammunition seem more complex and expensive to properly match with each other.
Once I reached a certain point of muscle exertion I have trouble figuring out how much strength I'm using and if I'm destroying something like elastic bands.
I like to see if I can lift or slightly move very heavy things just to see if I can. I have had people insist I tell them what I do for exercise some have actually badgered me about it and gotten upset, because the truth wasn't a good enough answer (I do remote ups, I lift my TV remote to change the channel) I don't exercise... I have been physically fit from helping move very heavy wooden beams, but at that point I would tell the seemingly amazed person/people what I did for work.